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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c87410b92a014f89ff8a7c250cbf04681b0ceb1ae6c8738bf7da061c3a03557' 
  AND token = 'svvgyo1oPpP/HAsFgIfCidEmjJibFi3CoVEJKQkHtn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}